US20020028122A1 - Ball screw nut - Google Patents
Ball screw nut Download PDFInfo
- Publication number
- US20020028122A1 US20020028122A1 US09/940,890 US94089001A US2002028122A1 US 20020028122 A1 US20020028122 A1 US 20020028122A1 US 94089001 A US94089001 A US 94089001A US 2002028122 A1 US2002028122 A1 US 2002028122A1
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- US
- United States
- Prior art keywords
- ball screw
- screw nut
- housing
- circulation
- several
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 210000002445 nipple Anatomy 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000007769 metal material Substances 0.000 abstract description 9
- 230000037361 pathway Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
- F16H25/2223—Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
- F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating balls
- F16H25/2219—Axially mounted end-deflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H2025/249—Special materials or coatings for screws or nuts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19702—Screw and nut
- Y10T74/19744—Rolling element engaging thread
- Y10T74/19749—Recirculating rolling elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19702—Screw and nut
- Y10T74/19744—Rolling element engaging thread
- Y10T74/19749—Recirculating rolling elements
- Y10T74/19767—Return path geometry
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19702—Screw and nut
- Y10T74/19744—Rolling element engaging thread
- Y10T74/19749—Recirculating rolling elements
- Y10T74/19767—Return path geometry
- Y10T74/19772—Rolling element deflector
Definitions
- the present invention relates to ball screw nut, in particular, to a ball screw nut whose inner part is made of metallic material, while outer part is covered with plastic material.
- the ball screw is a mechanical device which has been in use for a long time.
- a conventional ball screw is essentially composed of a screw bolt, a ball screw nut, and a plurality of rolling balls.
- the outer surface of the screw bolt is formed into a plurality of spiral grooves
- the ball screw nut has a hollow nut body and other structural part for the balls to circulate along.
- the essential object of the present invention is to simplify fabrication process of the screw bolt and nut unit so as to minimize the production cost of the same thereby widening the application field of the screw bolt and nut in industry.
- this part of the ball screw nut is constructed of a plastic material by ejection mold process so as to simplify the fabrication process and lower the production cost.
- FIG. 1 is a three dimensional view of the ball screw nut a first embodiment of the present invention.
- FIG. 2 is a three dimensional view of the screw threaded nipple in FIG. 1.
- FIG. 3 is a three dimensional view of the housing in FIG. 1.
- FIG. 4 is a fragmentary cross sectional view cut along line A-A of FIG. 1.
- FIG. 5 is a three dimensional view of the circulation cover plat in FIG. 1.
- FIG. 6 is a three dimensional view of the ball screw nut in a second embodiment of the present invention.
- FIG. 7 is three dimensional view of the screw threaded nipple in FIG. 6.
- FIG. 8 is a three dimensional view of the housing in FIG. 6.
- FIG. 9 is a three dimensional view of the end cap in FIG. 6.
- FIG. 10 is a three dimensional view of the ball screw nut in a third embodiment of the present invention.
- FIG. 11 is a three dimensional view of the screw threaded nipple in FIG. 10.
- FIG. 12 is a three dimensional view of the housing in FIG. 10.
- FIG. 13 is a three dimensional view of the ball screw nut in a fourth embodiment of the present invention.
- FIG. 14 is a three dimensional view of the screw threaded nipple in FIG. 13.
- FIG. 15 is a three dimensional view of the housing in FIG. 13.
- the ball screw nut comprises a screw threaded nipple 1 constructed of a metal and a housing 2 made of a plastic material.
- the nipple 1 is hollow with plurality of spiral grooves 11 formed on the inner surface thereof, for a plurality of balls to roll along.
- a housing 2 is enclosing the screw threaded nipple 1 directly by means of plastic ejection mold process, supersonic binding, or direct adhesion using a binder therebetween.
- the outer surface of nipple 1 can be made uneven by forming a plurality of grains (not shown). According to FIG.
- a cover plate 3 equipped with several containment holes 31 are tightened on the housing 2 by screw engaging through the containment holes 31 .
- a ball interrupter 261 is installed near the spiral groove 11 of the nipple 1 for hindering the balls to keep rolling around the spiral groove 11 .
- FIG. 2 shows the three dimensional view of the screw threaded nipple 1 in FIG. 1
- FIG. 3 shows the three dimensional view of the housing 2 in FIG. 1.
- several elongated waiver slots 12 parallel to the direction of the spiral grooves 11 are formed on the nipple 1 without interfering the function of the spiral grooves 11 in ball circulation region.
- an extension member 26 is formed at the position on the housing 2 corresponding to position of each trustee slot 12 for blocking in the waiver slot 12 after the housing 2 and the nipple 1 is bound together.
- a ball guide plate 262 is provided for directing the balls to leave the spiral groove 11 and move along in a direction induced by the ball guide plate 262 .
- a circulation groove 23 connected to the ball guide plate 262 between two adjacent extension members 26 is formed on the housing 2 for providing a pathway for the balls to circulate from one spiral groove 11 to the adjacent one according to induction of the ball guide plate 262 .
- Several screw holes 25 are bored on the housing 2 for screw engaging the cover plate 3 onto the housing 2 .
- FIG. 4 shows a fragmentary cross sectional view cut along line A-A of FIG. 1.
- the cover plate 3 is tightened to the housing 2 with screws 5 onto the crew holes 25 through containment holes 31 .
- a ball guide surface 321 of the cover plate 3 and the spiral groove 23 of the housing 2 is coupled together to form a pathway having an analogously circular cross section for balls
- the screws 5 are able to fix the cover plate 3 onto the housing 2 with a strong binding force by means of their effective increased number of threads notwithstanding the housing is made of plastic.
- FIG. 5 shows a three dimensional view of the circulation cover plate 3 in FIG. 1, a plurality of protruded blocks 32 each having an aforementioned arcuate ball guide surface 321 are formed beneath the cover plate 3 for guiding the balls to circulate along.
- the protruded block 32 is blocked in the circulation groove 23 of the housing 2 , while the ball guide surface 321 and the circulation groove 23 of the housing 2 are coupled to form a ball circulation pathway as mentioned above.
- FIG. 6 is a three dimensional view in a second embodiment of the present invention.
- two end surfaces of the nipple 1 are used for circulation of the balls.
- Inner side of the ball screw nut is the screw threaded nipple 1 made of a metallic material, while the housing 2 formed of a plastic material is fixed to the nipple 1 .
- the housing 2 has a flange 21 with several containment holes 211 for conjoining the ball screw nut to other structural members.
- the both sides of the housing 2 are covered with end caps 4 .
- the left side end cap is excluded in the drawing of FIG. 6. It can be observed in FIG.
- circulation groove 241 is formed on each protruded block 24 for ball circulation, further to this, a circulation hole 27 is provided abut on each circulation groove 241 for balls to turn around.
- the balls in the spiral groove 11 can reach the other end surface 4 of the housing 2 by way of the circulation groove 241 on the protruded block 24 and the circulation hole 27 .
- FIG. 7 a three dimensional view of the screw threaded nipple 1 in FIG. 6, and FIG. 8, a three dimensional view of the housing 2 in FIG. 6, several notches 13 are formed at both sides of the nipple 1 on the end surfaces of the nipple 1 for saving occupied space of the balls.
- the notches may be omitted so as to reduce to production cost
- FIG. 9 shows a tree dimensional view of the end cap in FIG. 6. As shown in FIG.
- FIG. 10 is a three dimensional view in a third embodiment of the present invention.
- the circulation groove 241 is used to circulate the balls from one spiral groove 11 to the adjacent one.
- the inner side of the ball screw nut is the screw threaded nipple 1 made of a metallic material, while the outer side thereof is the housing 2 formed of plastic, the housing 2 is firmly engaged onto the nipple 1 .
- FIG. 11 For fuller understanding the structural design about the nipple 1 and the housing 2 in the embodiment, reference should be made to both FIG. 11, a three dimensional view of the nipple 1 in FIG. 10, and FIG. 12, a three dimensional view of the housing 2 in FIG. 10.
- FIG. 11 several circulation holes 14 straddling the two adjacent spiral grooves 11 are formed on the nipple 1 for the balls to circulate from one spiral groove 11 to the adjacent one by way of the circulation groove 241 (see FIG. 10) in the circulation hole 14 .
- the protruded block 24 equipped with the circulation groove 241 whose width is slightly greater than the diameter of a ball is formed in the housing 2 so that the balls are able to circulate by way of circulation groove 241 .
- the protruded blocks is an integral part of the housing 2 formed of the same material as that of the housing 2 .
- FIG. 13 is a three dimensional view in a fourth embodiment of the present invention.
- the protruded block 24 on the spiral groove 11 is employed for the balls to circulate from one spiral groove 11 to the adjacent one.
- Each protruded block has more than one circulation grooves 241 .
- the inner side of the ball screw nut is the screw threaded nipple 1 made of the metallic material, while the outer side thereof is the housing 2 formed of plastic, the housing 2 is firmly engaged onto the nipple 1 .
- FIG. 14 a three dimensional view of the nipple 1 in FIG. 13, and FIG. 15, the three dimensional view of the housing 2 in FIG. 13, A long elongated hole 15 (see FIG.
- the protruded block 24 is an integral part of the housing 2 formed of the same material.
- the inner hollow screw threaded nipple can be easily constructed with a hard tubular metallic material to ensure the strength of the structure, on the other hand, the outer housing where requires less strength is formed of a plastic material by plastic ejection mold process so as to reduce the production cost and simplify the fabrication process.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to ball screw nut, in particular, to a ball screw nut whose inner part is made of metallic material, while outer part is covered with plastic material.
- 2. Description of the Prior Art
- The ball screw is a mechanical device which has been in use for a long time. A conventional ball screw is essentially composed of a screw bolt, a ball screw nut, and a plurality of rolling balls. The outer surface of the screw bolt is formed into a plurality of spiral grooves, whereas the ball screw nut has a hollow nut body and other structural part for the balls to circulate along. There is a plurality of spiral grooves formed in the inner surface of the nut body coupled with the spiral grooves of the screw bolt to form a pathway for those balls, thus the balls circulate along this pathway formed of the two parts of spiral grooves thereby the relative motion between the screw bolt and nut is carried out with reduced friction. It is well understood that a conventional screw bolt and nut unit is wholly made of metallic material which requires an intricate production process and heat treatment, in addition, fabrication of the associated accessories for a screw bolt and nut unit is also somewhat tricky. As a result, using a screw bolt and nut unit as transmission means is considered to be an expensive measure therefore discouraging wide application in industry.
- Aiming at the above depicted problems, the essential object of the present invention is to simplify fabrication process of the screw bolt and nut unit so as to minimize the production cost of the same thereby widening the application field of the screw bolt and nut in industry.
- After having carried out a long time research and experimentation, the present inventor came to a conclusion that using metallic material by means of ordinary mechanical process in fabricating the entire ball screw nut will be resulted in a high production cost.
- However, there is a problem that the contact between rolling balls and the spiral grooves formed in the screw bolt and nut unit is nearly a point contact made by a spheric steel ball and an inner curved surface of the spiral groove pathway where almost all portion of the loading force of the unit is exerted. In this situation, a metallic material or another equivalently hard material should be employed to fabricate the inner portion of the nut of the screw bolt and nut without compromising.
- In the meanwhile, the outer portion, i.e. housing of the ball screw nut is released from a heavy loading force. Accordingly, in the present invention, this part of the ball screw nut is constructed of a plastic material by ejection mold process so as to simplify the fabrication process and lower the production cost.
- To enable a further understanding of the innovative and technological content of the invention herein, refer to the detailed description of the invention and the accompanying brief description of the drawings appended below.
- FIG. 1 is a three dimensional view of the ball screw nut a first embodiment of the present invention.
- FIG. 2 is a three dimensional view of the screw threaded nipple in FIG. 1.
- FIG. 3 is a three dimensional view of the housing in FIG. 1.
- FIG. 4 is a fragmentary cross sectional view cut along line A-A of FIG. 1.
- FIG. 5 is a three dimensional view of the circulation cover plat in FIG. 1.
- FIG. 6 is a three dimensional view of the ball screw nut in a second embodiment of the present invention.
- FIG. 7 is three dimensional view of the screw threaded nipple in FIG. 6.
- FIG. 8 is a three dimensional view of the housing in FIG. 6.
- FIG. 9 is a three dimensional view of the end cap in FIG. 6.
- FIG. 10 is a three dimensional view of the ball screw nut in a third embodiment of the present invention.
- FIG. 11 is a three dimensional view of the screw threaded nipple in FIG. 10.
- FIG. 12 is a three dimensional view of the housing in FIG. 10.
- FIG. 13 is a three dimensional view of the ball screw nut in a fourth embodiment of the present invention.
- FIG. 14 is a three dimensional view of the screw threaded nipple in FIG. 13.
- FIG. 15 is a three dimensional view of the housing in FIG. 13.
- Referring to FIG. 1, a three dimensional view of the ball screw nut in a first embodiment of the present invention is shown. The ball screw nut comprises a screw threaded
nipple 1 constructed of a metal and ahousing 2 made of a plastic material. Thenipple 1 is hollow with plurality ofspiral grooves 11 formed on the inner surface thereof, for a plurality of balls to roll along. Ahousing 2 is enclosing the screw threadednipple 1 directly by means of plastic ejection mold process, supersonic binding, or direct adhesion using a binder therebetween. In order to enhance binding effect, the outer surface ofnipple 1 can be made uneven by forming a plurality of grains (not shown). According to FIG. 1, acover plate 3 equipped withseveral containment holes 31 are tightened on thehousing 2 by screw engaging through thecontainment holes 31. After finishing assembly of the ball screw nut, aball interrupter 261 is installed near thespiral groove 11 of thenipple 1 for hindering the balls to keep rolling around thespiral groove 11. - For illustrating the embodiment more understandable, reference should be made to FIG. 2 which shows the three dimensional view of the screw threaded
nipple 1 in FIG. 1, and FIG. 3 which shows the three dimensional view of thehousing 2 in FIG. 1. As clearly shown in FIG. 2, severalelongated asylum slots 12 parallel to the direction of thespiral grooves 11 are formed on thenipple 1 without interfering the function of thespiral grooves 11 in ball circulation region. As shown in FIG. 3, anextension member 26 is formed at the position on thehousing 2 corresponding to position of eachasylum slot 12 for blocking in theasylum slot 12 after thehousing 2 and thenipple 1 is bound together. Theball interrupter 261 is emerged out of the surface of thespiral groove 11 so as to prohibit the balls to pass through, on the other hand, aball guide plate 262 is provided for directing the balls to leave thespiral groove 11 and move along in a direction induced by theball guide plate 262. Acirculation groove 23 connected to theball guide plate 262 between twoadjacent extension members 26 is formed on thehousing 2 for providing a pathway for the balls to circulate from onespiral groove 11 to the adjacent one according to induction of theball guide plate 262.Several screw holes 25 are bored on thehousing 2 for screw engaging thecover plate 3 onto thehousing 2. - FIG. 4 shows a fragmentary cross sectional view cut along line A-A of FIG. 1. As it is shown in FIG. 4 detailedly, the
cover plate 3 is tightened to thehousing 2 withscrews 5 onto thecrew holes 25 throughcontainment holes 31. With this structure, aball guide surface 321 of thecover plate 3 and thespiral groove 23 of thehousing 2 is coupled together to form a pathway having an analogously circular cross section for balls Besides, as thescrew holes 25 are just aligned torespective extension members 26, thescrews 5 are able to fix thecover plate 3 onto thehousing 2 with a strong binding force by means of their effective increased number of threads notwithstanding the housing is made of plastic. - FIG. 5 shows a three dimensional view of the
circulation cover plate 3 in FIG. 1, a plurality ofprotruded blocks 32 each having an aforementioned arcuateball guide surface 321 are formed beneath thecover plate 3 for guiding the balls to circulate along. After thecover plate 3 is fitted to thehousing 2, theprotruded block 32 is blocked in thecirculation groove 23 of thehousing 2, while theball guide surface 321 and thecirculation groove 23 of thehousing 2 are coupled to form a ball circulation pathway as mentioned above. - FIG. 6 is a three dimensional view in a second embodiment of the present invention. In this embodiment, two end surfaces of the
nipple 1 are used for circulation of the balls. Inner side of the ball screw nut is the screw threadednipple 1 made of a metallic material, while thehousing 2 formed of a plastic material is fixed to thenipple 1. In the drawing thehousing 2 has aflange 21 withseveral containment holes 211 for conjoining the ball screw nut to other structural members. The both sides of thehousing 2 are covered withend caps 4. For illustrating the relative positional relationship between thehousing 2 and thenipple 1, the left side end cap is excluded in the drawing of FIG. 6. It can be observed in FIG. 6 that there are severalprotruded block 24 formed on the end surface of thehousing 2,circulation groove 241 is formed on eachprotruded block 24 for ball circulation, further to this, acirculation hole 27 is provided abut on eachcirculation groove 241 for balls to turn around. The balls in thespiral groove 11 can reach theother end surface 4 of thehousing 2 by way of thecirculation groove 241 on theprotruded block 24 and thecirculation hole 27. - Referring to FIG. 7, a three dimensional view of the screw threaded
nipple 1 in FIG. 6, and FIG. 8, a three dimensional view of thehousing 2 in FIG. 6,several notches 13 are formed at both sides of thenipple 1 on the end surfaces of thenipple 1 for saving occupied space of the balls. In case the total length of a ball screw nut is not a problem worthy of consideration, the notches may be omitted so as to reduce to production cost FIG. 9 shows a tree dimensional view of the end cap in FIG. 6. As shown in FIG. 9,several guide grooves 41 are formed on theend cap 4, in assembling theend cap 4 to thehousing 2, the surface whereguide grooves 41 are formed is attached to the end surface of thehousing 2 such that theguide grooves 41 and thecirculation grooves 241 are coupled together to form a path way for ball circulation. FIG. 10 is a three dimensional view in a third embodiment of the present invention. In this embodiment, thecirculation groove 241 is used to circulate the balls from onespiral groove 11 to the adjacent one. The inner side of the ball screw nut is the screw threadednipple 1 made of a metallic material, while the outer side thereof is thehousing 2 formed of plastic, thehousing 2 is firmly engaged onto thenipple 1. - For fuller understanding the structural design about the
nipple 1 and thehousing 2 in the embodiment, reference should be made to both FIG. 11, a three dimensional view of thenipple 1 in FIG. 10, and FIG. 12, a three dimensional view of thehousing 2 in FIG. 10. As shown in FIG. 11,several circulation holes 14 straddling the twoadjacent spiral grooves 11 are formed on thenipple 1 for the balls to circulate from onespiral groove 11 to the adjacent one by way of the circulation groove 241 (see FIG. 10) in thecirculation hole 14. The protrudedblock 24 equipped with thecirculation groove 241 whose width is slightly greater than the diameter of a ball is formed in thehousing 2 so that the balls are able to circulate by way ofcirculation groove 241. The protruded blocks is an integral part of thehousing 2 formed of the same material as that of thehousing 2. - FIG. 13 is a three dimensional view in a fourth embodiment of the present invention. In this embodiment, the protruded
block 24 on thespiral groove 11 is employed for the balls to circulate from onespiral groove 11 to the adjacent one. Each protruded block has more than onecirculation grooves 241. Similar to the previous embodiments, the inner side of the ball screw nut is the screw threadednipple 1 made of the metallic material, while the outer side thereof is thehousing 2 formed of plastic, thehousing 2 is firmly engaged onto thenipple 1. - For fuller understanding the structural design about the
nipple 1 and thehousing 2 in this embodiment, reference should be made to both FIG. 14, a three dimensional view of thenipple 1 in FIG. 13, and FIG. 15, the three dimensional view of thehousing 2 in FIG. 13, A long elongated hole 15 (see FIG. 14) approximately laid parallel to longitudinal axis of the ball screw nut and encompassed several several loops ofspiral grooves 11 is formed on thenipple 1 and the protrudedblock 24 having several loops ofcirculation grooves 241 is formed inside thehousing 2 at a position corresponding to theelongated hole 15 for the balls to circulate form onespiral groove 11 to the adjacent one by way of thecirculation grooves 241 of protrudedblock 24. The protrudedblock 24 is an integral part of thehousing 2 formed of the same material. - It emerges from the description of the above embodiments that the invention has several noteworthy advantages, in particular, the inner hollow screw threaded nipple can be easily constructed with a hard tubular metallic material to ensure the strength of the structure, on the other hand, the outer housing where requires less strength is formed of a plastic material by plastic ejection mold process so as to reduce the production cost and simplify the fabrication process.
- Other embodiments of the present invention will become obvious to those skilled in the art in light of above disclosure. It is of course also understood that the scope of the present invention is not to be determined by the foregoing description, but only by the following claims.
Claims (24)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/688,899 US20040083841A1 (en) | 2000-09-01 | 2003-10-21 | Ball screw nut |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW089215236U TW435626U (en) | 2000-09-01 | 2000-09-01 | A ball nut of ball screw |
TW089215236 | 2000-09-01 | ||
TW89215236U | 2000-09-01 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/688,899 Division US20040083841A1 (en) | 2000-09-01 | 2003-10-21 | Ball screw nut |
Publications (2)
Publication Number | Publication Date |
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US20020028122A1 true US20020028122A1 (en) | 2002-03-07 |
US6668672B2 US6668672B2 (en) | 2003-12-30 |
Family
ID=21672291
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/940,890 Expired - Lifetime US6668672B2 (en) | 2000-09-01 | 2001-08-29 | Ball screw nut |
US10/688,899 Abandoned US20040083841A1 (en) | 2000-09-01 | 2003-10-21 | Ball screw nut |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US10/688,899 Abandoned US20040083841A1 (en) | 2000-09-01 | 2003-10-21 | Ball screw nut |
Country Status (4)
Country | Link |
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US (2) | US6668672B2 (en) |
JP (1) | JP2002089652A (en) |
DE (1) | DE10141996C5 (en) |
TW (1) | TW435626U (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070293962A1 (en) * | 2004-02-01 | 2007-12-20 | Thk Co., Ltd. | Design Method for Industrial Product Using Clothoid Curve, Industrial Products Designed by the Design Method, and Method and Device for Numerical Control Using the Clothoid Curve |
US20110091299A1 (en) * | 2009-10-16 | 2011-04-21 | Chao-Chin Weng | Fastening assembly and method for manufacturing fastening assembly at case |
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- 2001-08-28 DE DE10141996A patent/DE10141996C5/en not_active Expired - Lifetime
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US20070293962A1 (en) * | 2004-02-01 | 2007-12-20 | Thk Co., Ltd. | Design Method for Industrial Product Using Clothoid Curve, Industrial Products Designed by the Design Method, and Method and Device for Numerical Control Using the Clothoid Curve |
US7860592B2 (en) * | 2004-02-27 | 2010-12-28 | Thk Co., Ltd. | Design method for industrial product using clothoid curve, industrial products designed by the design method, and method and device for numerical control using the clothoid curve |
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US8807897B2 (en) | 2009-10-16 | 2014-08-19 | Pegatron Corporation | Fastening assembly and method for manufacturing fastening assembly at case |
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US20140326090A1 (en) * | 2011-09-01 | 2014-11-06 | Robert Bosch Gmbh | Method for producing a threaded part as composite component, roller screw drive, linear actuator, and electromechanical brake booster having such a composite component |
CN103407167A (en) * | 2013-07-11 | 2013-11-27 | 陈群芳 | Method for processing pacifier |
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US20180209521A1 (en) * | 2015-08-04 | 2018-07-26 | Schaeffler Technologies AG & Co. KG | Ball screw drive |
US11015688B2 (en) * | 2015-08-04 | 2021-05-25 | Schaeffler Technologies AG & Co. KG | Ball screw drive |
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US20210364026A1 (en) * | 2015-12-09 | 2021-11-25 | Black & Decker Inc. | Shallow undercut concrete anchor |
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US11268607B1 (en) | 2016-02-17 | 2022-03-08 | Helix Linear Technologies | Lead screw nuts having threads formed from different materials |
US12018743B1 (en) | 2016-02-17 | 2024-06-25 | Helix Linear Technologies | Lead screw nuts having threads formed from different materials |
USD1016599S1 (en) * | 2017-02-17 | 2024-03-05 | Helix Linear Technologies | Nut |
US11655885B2 (en) * | 2019-12-06 | 2023-05-23 | Pacific Bearing Corp. | Multiliner for multiple start ball nut threads |
EP4283163A1 (en) * | 2022-05-24 | 2023-11-29 | SFS Group International AG | Ball screw |
Also Published As
Publication number | Publication date |
---|---|
US6668672B2 (en) | 2003-12-30 |
JP2002089652A (en) | 2002-03-27 |
DE10141996A1 (en) | 2002-03-28 |
US20040083841A1 (en) | 2004-05-06 |
DE10141996C5 (en) | 2009-09-10 |
DE10141996B4 (en) | 2005-03-17 |
TW435626U (en) | 2001-05-16 |
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